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Stock Plans (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Summary of Stock Option and RSA Activity  
Beginning Balance, Shares 56,963
Granted, shares 1,197
Exercised, shares (14,813)
Forfeited, shares (349)
Expired, shares (541)
Ending Balance, Shares 42,457
Beginning balance, weighted average exercise price $ 39.54
Granted, weighted average exercise price $ 44.78
Exercised, weighted average exercise price $ 33.97
Forfeitures, weighted average exercise price $ 29.24
Expired, weighted average exercise price $ 44.90
Ending balance, weighted average exercise price $ 41.63
Options vested and expected to vest, shares 42,359
Options vested and expected to vest, Weighted Average Exercise Price $ 41.64
Options exercisable, shares 35,275
Options exercisable, Weighted Average Exercise Price $ 43.10
Beginning balance, shares 15,074
Granted, shares 4,759
Vested, shares (4,986)
Forfeited, shares (851)
Ending balance, shares 13,996
Beginning Balance, Weighted Average Grant Price $ 28.97
Granted, Weighted Average Grant Price $ 45.11
Vested, Weighted Average Grant Price $ 30.74
Forfeited, Weighted Average Grant Price $ 31.44
Ending Balance, Weighted Average Grant Price $ 33.69